Starting in 2026, March Madness bettors will face a mixed federal tax change: sportsbooks will issue fewer W-2G forms because the reporting threshold rises, but loss deductions become less generous. That combination matters because many bettors wrongly treat tax forms as the trigger for tax liability. They are not. All gambling winnings remain taxable, including small app bets, office pools, and informal NCAA tournament wagers that never generate a form.
What changes in 2026 for March Madness bettors
The clearest federal change is the W-2G reporting threshold. Beginning in 2026, a sportsbook generally issues a W-2G when winnings are at least $2,000 and at least 300 times the amount wagered. That is a higher threshold than in prior years, so some bettors will receive fewer tax forms even if they keep winning during March Madness.
The more important shift for many regular bettors is on deductions. Gambling losses are still deductible only if the taxpayer itemizes on Schedule A, but from 2026 onward the deduction is capped at 90% of losses. Before that change, losses could generally offset winnings up to 100% of the amount lost. A bettor who breaks even over the tournament may still end up with taxable gambling income because the federal deduction no longer fully matches losses.
Federal withholding rules do not disappear. Sportsbooks must generally withhold 28% on certain winnings over $5,000. That withholding can feel like the final tax bill, but it is only a prepayment. The actual amount owed still depends on total annual income, filing status, and tax bracket.
Why fewer tax forms does not mean less tax exposure
A common mistake is assuming that only large wins or reported wins count. The IRS position is broader: all gambling winnings are taxable income whether or not a W-2G is issued. If a March Madness bettor wins a series of smaller bets, cashes an office bracket pool, or gets paid through a peer-to-peer app after a friendly wager, that income still belongs on the federal return.
For casino and sportsbook users, this matters because licensed operators keep transaction records and often report activity to tax authorities. A bettor may not receive a form for every winning event, but the operator still has account-level data. Informal bets are less likely to produce third-party reporting, yet that does not make them exempt. Large cash movements or mismatches between known gambling activity and reported income can still create audit risk.
The practical record-keeping standard is now higher
The 2026 rules make personal records more important, not less. If fewer W-2Gs arrive while all winnings remain taxable, the bettor has to bridge that gap with accurate logs. A useful record should include the date, event, type of wager, amount staked, amount won or lost, and where the bet was placed. Sportsbook account histories help, but they are not a substitute for keeping your own organized file.
This is especially important for anyone betting heavily through March and into other sports seasons. Once gambling income starts to become a meaningful part of annual cash flow, weak records create two problems at once: unreported winnings are easier to miss, and deductible losses become harder to support if the IRS asks for proof. Bettors with more than $25,000 in annual gambling income should be especially cautious and may need professional tax help because the reporting and deduction issues stop being simple very quickly.
Where the federal rules bite hardest
The practical effect of the new rules depends on how you bet. A bettor who lands one large NCAA tournament payout may mainly deal with withholding and bracket effects. A bettor who places many smaller wagers and roughly breaks even may feel the 90% loss deduction cap more sharply, because taxable income can remain even when the bankroll does not grow.
| Issue | Federal rule from 2026 | Practical effect for bettors |
|---|---|---|
| W-2G reporting | Issued at $2,000 in winnings and 300x the wager | Fewer forms may be issued, but all winnings still must be reported |
| Loss deductions | Allowed only if itemizing; capped at 90% of losses | Breakeven or near-breakeven bettors may still owe federal tax |
| Withholding | 28% on certain winnings over $5,000 | Cash is withheld upfront, but final tax may be higher or lower |
| Small or informal bets | Still taxable even without a tax form | Office pools and casual March Madness bets cannot be ignored on the return |
There is also a difference between withholding and final liability. Someone in a lower effective tax range may have too much withheld and later recover part of it. Someone with substantial salary income, investment income, or repeated betting wins may still owe more at filing time because gambling income stacks on top of other taxable income and is taxed progressively.
The next checkpoint is state tax treatment and payout handling
Federal law is only part of the picture. States do not all follow the same gambling tax rules, and some do not adopt the new federal 90% cap on deductible losses. New Jersey is one example often cited because state treatment can differ from the federal approach. That means a bettor could face one set of limits on the federal return and another on the state return, which changes the real after-tax value of March Madness winnings.
That is the next place bettors should look before assuming a payout is fully usable cash. Check whether your state taxes gambling winnings, whether it allows loss deductions, whether it follows federal itemizing rules, and whether a sportsbook withholds state tax at payout. For bettors using licensed operators in multiple states, those differences can affect where records need to be separated and which return ends up carrying the tax bill.
If there is one practical rule to keep in mind through the NCAA tournament, it is this: do not use the presence or absence of a W-2G as your tax guide. The safer standard is to treat every win as reportable, keep records strong enough to support losses, and verify state rules before deciding what a withdrawal actually means after tax.
